<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>flex布局-主轴对齐方式</title>
  <style>
    .box {
      display: flex;
      /* 左对齐，默认值 */
      /* justify-content: flex-start; */

      /* 右对齐 */
      /* justify-content: flex-end; */

      /* 居中 */
      /* justify-content: center; */

      /* 父级剩余的尺寸分配成间距 */

      /* 弹性盒子之间的间距相等 */
      /* justify-content: space-between; */

      /* 间距出现在弹性盒子两侧 */
      /* 视觉效果：弹性盒子之间的间距是两端间距的2倍 */
      /* justify-content: space-around; */

      /* 各个间距都相等 */
      justify-content: space-evenly;

      height: 300px;
      border: 1px solid #000;
    }

    .box div {
      width: 200px;
      height: 100px;
      background-color: pink;
    }
  </style>
</head>
<body>
  <div class="box">
    <div>1</div>
    <div>2</div>
    <div>3</div>
  </div>
</body>
</html>